Technologies are described herein for caching and exposing pre-send data relating to the sender or recipient of an e-mail message. A mail client program is configured to cache recipient and configuration mail tips at a client computer. The configuration mail tips may be retrieved from a server computer and cached when the mail client program is started. Recipient mail tips may be retrieved and cached as each recipient of an e-mail message is identified. When subsequent e-mail messages are created, cached mail tips for an e-mail recipient are utilized instead of retrieving the mail tips from the server computer. The cached mail tips may be updated after a predefined period of time has elapsed. The cached mail tips may also be utilized when the client program is offline or unable to establish a connection to the server computer.